Control systems comprising supplementary closure devices and inwardly inflating pack-off devices

ABSTRACT

A supplementary closure device system comprising: a tubular, a supplementary closure device disposed in the tubular, wherein the supplementary close device comprises a housing and one or more flapper fingers disposed on the housing, and a pack-off device and associated methods.

This application claims the benefit of U. S. Provisional Application No.62/069,519 filed Oct. 28, 2014, which is incorporated herein byreference.

BACKGROUND

The present disclosure relates generally to supplementary closuredevices used in association with pack-off devices. More specifically, incertain embodiments, the present disclosure relates to supplementaryclosure devices capable of being used in association with inwardlyinflating inflatable packers and associated methods and systems.

During drilling or production, a well may experience an uncontrolledrelease of hydrocarbons. One method of controlling this uncontrolledrelease is through the use a collapsible insert device. Briefly,collapsible insert devices are wellbore inserts that may comprise ahousing that surrounds a collapsible insert. The collapsible insertdevice may be installed within a tubular, and when that tubularexperiences an uncontrolled release of hydrocarbons, the collapsibleinsert device may be activated thus sealing the wellbore. Examples ofcollapsible insert devices are discussed in U.S Patent ApplicationPublication No. 2013/0214183, the entirety of which is herebyincorporated by reference.

One potential problem with collapsible insert devices is that they maynot fully seal a well. For example, if a collapsible insert device doesnot obtain a closure of at least 96% then it may not effectively controlthe flow of hydrocarbons from the wellbore. In some instances, if flowcontinues through the sleeve for a finite period while the sleeve doesnot have a consistent closure of at least 96%, flow erosion may breach awall of the collapsed collapsible insert device sleeve. Other potentialproblems with collapsible insert devices may include the completefailure of the collapsible insert device to close or uneven closure.Uneven closure may result in higher fluid velocity rates through thesleeve, lack of pressure drop, and high erosion rates.

Recently, a supplementary control device has been developed that assistsin the control of hydrocarbons. Examples of such devices are disclosedin U.S. Patent Application Ser. No. 61/975,292, the entirety of which ishereby incorporated by reference. These devices may form an additionalclosure in an open wellbore to stop, or substantially reduce, anuncontrolled release of hydrocarbons. In certain embodiments, thesedevices may be used in conjunction with a collapsible insert device.

However, these supplementary control devices themselves may also haveproblems fully sealing a well in certain embodiments. For example, whenthere is a pipe disposed within the production tubular, thesupplementary control device may not be able to provide a seal. Incertain instances, the pipe passing through the supplementary controldevice may prevent the supplementary control device and the collapsibleinsert device from fully closing and sealing the wellbore. Additionally,even when there is no pipe passing through the supplementary controldevice and the supplementary control device is able to be fully closed,an additional seal may be desirable to fully seal the well.

It is desirable to develop a method of completely sealing a down holesystem comprising a tubular and a pipe disposed within the tubular.

SUMMARY

The present disclosure relates generally to supplementary closuredevices used in association with pack-off devices. More specifically, incertain embodiments, the present disclosure relates to supplementaryclosure devices capable of being used in association with inwardlyinflating inflatable packers and associated methods and systems.

In one embodiment, the present disclosure provides a supplementaryclosure device system comprising: a tubular, a supplementary closuredevice disposed in the tubular, wherein the supplementary close devicecomprises a housing and one or more flapper fingers disposed on thehousing, and a pack off device disposed in the tubular.

In another embodiment, the present disclosure provides a supplementaryclosure device system comprising: a tubular, a supplementary closuredevice disposed in the tubular, wherein the supplementary close devicecomprise a housing and one or more flapper fingers disposed on thehousing, a pipe passing through the supplementary closure device; and apack off device disposed in the tubular.

In another embodiment, the present disclosure provides a methodcomprising: providing a supplementary closure device system comprising asupplementary closure device, and a pack off device, and a tubular andactivating the supplementary closure device to seal the tubular.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete and thorough understanding of the present embodimentsand advantages thereof may be acquired by referring to the followingdescription taken in conjunction with the accompanying drawings.

FIG. 1 is an illustration of a supplementary closure device system inaccordance with certain embodiments of the present disclosure.

FIG. 2 is an illustration of a supplementary closure device system inaccordance with certain embodiments of the present disclosure.

FIG. 3 is an illustration of a supplementary closure device system inaccordance with certain embodiments of the present disclosure.

FIG. 4 is an illustration of a supplementary closure device system inaccordance with certain embodiments of the present disclosure

The features and advantages of the present disclosure will be readilyapparent to those skilled in the art. While numerous changes may be madeby those skilled in the art, such changes are within the spirit of thedisclosure.

DETAILED DESCRIPTION

The description that follows includes exemplary apparatuses, methods,techniques, and/or instruction sequences that embody techniques of theinventive subject matter. However, it is understood that the describedembodiments may be practiced without these specific details.

The present disclosure relates generally to supplementary closuredevices used in association with pack-off devices. More specifically, incertain embodiments, the present disclosure relates to supplementaryclosure devices capable of being used in association with inwardlyinflating inflatable packers and associated methods and systems.

There may be several advantages of the methods and systems describedherein. In certain embodiments, the methods and systems described hereinallow for the sealing of a wellbore system that comprise a tubular and apipe disposed within the tubular. In certain embodiments, the methodsand systems described herein allow for the sealing of a wellbore systemthat comprises a tubular with no pipe disposed within the tubular.

Referring now to FIG. 1, FIG. 1 illustrates a supplementary closuredevice system 1000. In certain embodiments, supplementary closure devicesystem 1000 may comprise a tubular 1100, a supplementary closure device1200, and pack-off device 1300.

In certain embodiments, tubular 1100 may comprise any type of tubular.In certain embodiments, tubular 1100 may comprise a casing string or aliner. In certain embodiments, supplementary closure device 1200 maycomprise a part of tubular 1100.

In certain embodiments, supplementary closure device 1200 may compriseany conventional supplementary closure device. Examples of suitablesupplementary closure devices are disclosed in US 61/975,292. In otherembodiments, supplementary closure device 1200 may comprise a surfacecontrolled sub-surface safety valve.

In certain embodiments, supplementary closure device 1200 may comprise ahousing 1210 and one or more flapper fingers 1220.

In certain embodiments, housing 1210 may be constructed of anyconventional downhole material suitable for use as a tubular. In certainembodiments, housing 1210 may be constructed out of steel, cast iron,cast steel, and/or stainless steel. In certain embodiments, housing 1210may have a cylindrical shape with a hollow center. In certainembodiments, housing 1210 may comprise an outside surface (notillustrated in FIG. 1), an inside surface (not illustrated in FIG. 1), atop surface (not illustrated in FIG. 1), and a bottom surface (notillustrated in FIG. 1). In certain embodiments, housing 1210 may furthercomprise a groove (not illustrated in FIG. 1). In certain embodiments,an O-ring (not illustrated in FIG. 1) may be disposed in the groove.

In certain embodiments, housing 1210 may be from 4 to 20 inches inlength. In certain embodiments, housing 1210 may have an outer diameterof from 5 to 15 inches, an inner diameter of from 4 to 14 inches, and/ora thickness of 0.25 to 1 inches. In certain embodiments, housing 1210may have an outer diameter of 11.75 inches, an inner diameter of 8.5inches, and/or a thickness of 1.625 inches.

In certain embodiments, the top surface of housing 1210 may have severalindented portions comprising indented surfaces (not illustrated inFIG. 1) and side surfaces (not illustrated in FIG. 1). In certainembodiments, the side surfaces may each define a cavity.

In certain embodiments, flapper fingers 1220 may be constructed out ofany conventional downhole material suitable for use as a tubular. Incertain embodiments, flapper fingers 1220 may be constructed out ofsteel, cast iron, cast steel, stainless steel, Incalloy/Inconel, and/ortitanium. In certain embodiments, flapper fingers 1220 may be arrowshaped and/or comprise base portions (not illustrated in FIG. 1), sidesealing faces (not illustrated in FIG. 1), back sealing faces (notillustrated in FIG. 1), bottom surfaces (not illustrated in FIG. 1), andtop surfaces (not illustrated in FIG. 1). In certain embodiments, thebase portions may define one or more cavities.

In certain embodiments, the one or more flapper fingers 1220 may bedisposed on the top surface of housing 1210. In certain embodiments,supplementary closure device 1200 may comprise 6, 8, 10, or 12 flapperfingers 1220 disposed and equispaced on the top surface of housing 1210.In certain embodiments, the base portion of flapper fingers 1220 may bein contact with the side surfaces of housing 1210. In certainembodiments, the base portion of flapper fingers 1220 may be disposedwithin the indented portions of the top surfaces of housing 1210.

In certain embodiments, flapper fingers 1220 may be attached to housing1210 through the use of a pivot pin (not illustrated in FIG. 1) and atorsion spring (not illustrated in FIG. 1). In certain embodiments, thepivot pin may be disposed in the cavities defined by the side surfacesand the base portion. In certain embodiments, the torsion spring may bedisposed around the pivot pin. In certain embodiments, the torsionspring may be capable of keeping supplementary closure device in aclosed position, as further described below.

In certain embodiments, illustrated in FIG. 1, supplementary closuredevice 1200 may be in an open position. In such embodiments, flapperfingers 1220 are arranged such that they do not restrict flow throughsupplementary closure device 1200. In such embodiments, flapper fingers1220 may be vertically disposed on housing 1210. In certain embodiments,the top surfaces of flapper fingers 1220 may be in vertical alignmentwith the outside surface of housing 1210.

In certain embodiments, illustrated in FIG. 2, supplementary closuredevice 1200 may be in a closed position. In such embodiments, flapperfingers 1220 are arranged such that they restrict flow throughsupplementary closure device 1200. In such embodiments, there is notubular passing through supplementary closure device 1200. In certainembodiments, the restriction may be a complete restriction or a partialrestriction. In certain embodiments, flapper fingers 1220 may bearranged such that they restrict 100% of the flow when in the closedposition.

In certain embodiments, supplementary closure device 1200 may be capableof providing a pressure containment up to 5000 psi when in the closedposition. In certain embodiments, supplementary closure device 1200 maybe capable of providing a pressure containment in excess of 5000 psiwhen in the closed position. In certain embodiments, the selection ofmaterials used for the flapper fingers 1220 and housing 1210 may governthe amount of pressure containment supplementary closure device 1200 maywithstand.

In certain embodiments, when in the closed position, the side sealingfaces of each of each flapper fingers 1220 may be in sealing contactwith the side sealing faces of the adjacent flapper fingers 1220. Insuch embodiments, flapper fingers 1220 may create a self-supportingbridge effectively sealing the supplementary closure device.

In certain embodiments, supplementary closure device 1200 may bedisposed within an outer housing 1120 of tubular 1100. In certainembodiments, outer housing 1120 may match or exceed the physical andchemical ratings of tubular 1100. In certain embodiments, outer housing1120 may comprises top, middle, and bottom cylindrical components thatmay be threadedly connected to each other by metal-to-metal premiumsealing threads.

In certain embodiments, outer housing 1120 may comprise a stop sleeve1121. In certain embodiments, stop sleeve 1121 may be an integral partof outer housing 1120. In other embodiments, stop sleeve 1121 may bedisposed within outer housing 1120. In certain embodiments, whensupplementary closure device 1200 is in the open position, the bottomsurfaces of the flapper fingers of supplementary closure device 1200 maybe in contact with the outer housing.

In certain embodiments, an inner sleeve assembly may be disposed withinouter housing 1120. In certain embodiments, the inner sleeve assemblymay comprise inner sleeve 1133 and/or spacer sleeve 1134. In certainembodiments, inner sleeve assembly may be held in a down position by oneor more shear pins 1131. In such embodiments, the one or more flapperfingers of supplementary closure device 1200 may be held in the openposition and the torsion springs of supplementary closure device 1200may be torsionally loaded. In such embodiments, inner sleeve 1133 maycover the inner surfaces of the flapper fingers 1220 providingprotection and smooth flow of any wellbore fluids.

Furthermore, in such embodiments, once shear pin 1131 is sheared, gaspropellant or hydraulic pressure may move the inner sleeve 1133 upwardallowing for the one or more flapper fingers to rotate upward and bringsupplementary closure device 1200 into the closed position.

In certain embodiments, activation of explosive material 1150 may moveinner sleeve 1133 to shear shear pins 1131. In certain embodiments,explosive material 1150 may be a solid propellant. In certainembodiments, explosive 1150 may initiate a gas pressure surge to moveinner sleeve 1133 in response to an activation signal. In certainembodiments, explosive material 1150 may be disposed within an annulusformed by outer housing 1120 and inner sleeve 1133. In certainembodiments, explosive material 1150 may be disposed within a propellantcavity (not illustrated in FIG. 1).

In certain embodiments, explosive material 1150 may comprise any solidgas propellant. Examples of suitable solid gas propellants include solidgas propellants that comprises/contains potassium perchlorate. Incertain embodiments, the solid gas propellant may comprise potassiumperchlorate mixed with a resin. In certain embodiments a Lead Azide maybe used as a primer for the solid gas propellant.

In certain embodiments, pack-off device 1300 may comprise an inwardlyinflating inflatable pack-off device. Examples of suitable inwardlyinflating inflatable pack-off devices are discussed in U.S. Pat. Nos.4,052,861, 4,063,427, 4,337,010, and 4,372,704, the entireties of whichare hereby incorporated by reference.

In certain embodiments, pack-off device 1300 may comprise an inwardlyinflating inflatable packer. In certain embodiments, pack-off device1300 may comprise an outer housing 1310, element reinforcement 1320,sealing element 1340, bottom sub 1350, an injection port 1360, inflationelement 1370, and seal 1380.

In certain embodiments, outer housing 1310 may comprise an upper end anda lower end. In certain embodiments, outer housing 1310 may have aninner diameter of 8.5 inches, an outer diameter of 11.75 inches, and alength of 12 feet. In other embodiments, outer housing 1310 may have aninner diameter of 12.25 inches, an outer diameter of 15 inches, and alength of 12 feet.

In certain embodiments, lower end of outer housing 1310 may comprise adraw feature. In certain embodiments, a seal may be disposed betweenbottom sub 1350 and outer housing 1310. In certain embodiments, bottomsub 1350 may be sheared-pinned in place by shear pin 1390. In certainembodiments, when the pack-off device is inflated, shear pin 1390 may besheared allowing bottom sub 1350 to slide sealingly engaged in the boreof the packer outer housing 1310 when the packer starts to inflate. Thisdraw feature allows the inflation element 1370 to move inwards due tothe effects of the external gas pressure on the inflation element 1370and the upward movement of the inflation element 1370 and sliding bottomsub 1350.

In certain embodiments, rubber inflation element 1370 may comprisecontinuous or discontinuous reinforcing ribs (made of stainless steel,or carbon steel) disposed outwith sealing element 1340.

In certain embodiments, injection port 1360 may comprise a singleinjection port 1360 or a series of injection ports 1360. In certainembodiments, injection port 1360 may allow for gas to be introduced intoan annular space between the sealing element 1340 and outer housing1310.

In certain embodiments, illustrated in FIG. 1, pack-off device 1300 maybe in an uninflated position. In other embodiments, illustrated in FIG.2, pack-off device 1300 may be in an inflated position. In suchembodiments, pack-off device 1300 may provide a restriction of flowthrough tubular 1100. In certain embodiments, the restriction may be acomplete restriction or a partial restriction. In certain embodiments,approximately 50% of the flow through tubular 1100 may be restrictedonce pack-off device 1300 is inflated.

In certain embodiments, inflatable pack-off device 1300 may be capableof providing a pressure containment up to 5000 psi when in the inflatedposition. In certain embodiments, pack-off device 1300 may be capable ofproviding a pressure containment in excess of 5000 psi when in theinflated position. In certain embodiments, the selection of materialsused for pack-off device 1300, and the size of the tubular 1100 it isdisposed within, may govern the amount of pressure containment thatpack-off device 1300 may withstand.

In operation, supplementary closure device system 1000 may be activatedby activating both supplementary closure device 1200 and pack-off device1300 individually or together. In certain embodiments, supplementaryclosure device 1200 and pack-off device 1300 may be activatedsimultaneously. In other embodiments, supplementary closure device 1200and pack-off device 1300 may be activated sequentially. In certainembodiments, supplementary closure device system 1000 may be activatedby only activating one of supplementary closure device 1200 and pack-offdevice 1300.

In certain embodiments, supplementary closure device 1200 may beactivated by activating explosive material 1150. Explosive material 1150may be activated by a signal that is sent to a downhole receiver whichin turn activates/switches on a battery pack which sends an electricalcharge to the detonator package which ignites the primer and solidpropellant to create the gas pressure. Once activated, propellant gasgenerated from explosive material 1150 may be applied to inner sleeve1133 which then shears the one or more shear pins 1131. Once the one ormore shear pins 1131 have been sheared, pressure from the propellant gasgenerated from explosive material 1150 may then move inner sleeve 1133upwards until it contacts spacer sleeve 1134. This contact then allowstorsion springs to urge the flapper fingers to rotate around the pivotpins in the housing and move into the closed position where theysealingly meet and mate together, thus restricting or cutting offfluid/gas/entrained particle flow that may be flowing up from thewellbore.

Alternatively, in other embodiments, supplementary closure device 1200may be activated by utilizing hydraulic pressure rather than propellantgas to apply pressure to inner sleeve 1133.

In certain embodiments, pack-off device 1300 may be activated byactivating explosive material 1150. Explosive material 1150 may beactivated by a signal that is sent to a downhole receiver which in turnactivates/switches on a battery pack which sends an electrical charge tothe detonator package which ignites the primer and solid propellant tocreate the gas pressure. Once activated, propellant gas generated fromexplosive material 1150 may enter injection port 1360 of pack-off device1300. The propellant gas may then inwardly inflate the inflation element1370 until tubular is effectively sealed.

Alternatively, in other embodiments, pack-off device 1300 may beactivated by utilizing hydraulic pressure rather than propellant gas toapply pressure to inflate the inflation element 1370.

In certain embodiments, pack-off device 1300 and supplementary closuredevice 1200 may be activated by activating a single source of explosivematerial 1150. In other embodiments, pack-off device 1300 andsupplementary closure device 1200 may be activated independently byactivating separate explosive materials 1150.

Referring now to FIG. 3, FIG. 3 illustrates a supplementary closuredevice system 2000. In certain embodiments, supplementary closure devicesystem 2000 may comprise a tubular 2100, a supplementary closure device2200, pack-off device 2300, and a drill pipe 2400.

In certain embodiments, tubular 2100 may comprise any type of tubular.In certain embodiments, tubular 2100 may comprise a casing string or aliner. In certain embodiments, supplementary closure device 2200 maycomprise a part of tubular 2100.

In certain embodiments, supplementary closure device 2200 may compriseany combination of features discussed above with respect tosupplementary closure device 1200. In certain embodiments, supplementaryclosure device 2200 may comprise a housing 2210 and one or more flapperfingers 2220.

In certain embodiments, housing 2210 may comprise any combination offeatures discussed above with respect to housing 1210.

In certain embodiments, flapper fingers 2220 may comprise anycombination of features discussed above with respect to flapper fingers1220.

In certain embodiments, illustrated in FIG. 3, supplementary closuredevice 2200 may be in an open position. In such embodiments, flapperfingers 2220 are arranged such that they do not restrict flow throughsupplementary closure device 2200. In such embodiments, flapper fingers2220 may be vertically disposed on housing 2210. In certain embodiments,the top surfaces of flapper fingers 2220 may be in alignment with theoutside surface of housing 2210.

In certain embodiments, illustrated in FIG. 4, supplementary closuredevice 2200 may be in a partially closed position. In such embodiments,a pipe 2400 passing through supplementary closure device 2200 mayprevent supplementary closure device 2200 from closing to the fullyclosed position. In certain embodiments, supplementary closure device2200 may not alone be capable of providing a pressure containment whenin the partially closed position. In such embodiments, flapper fingers2220 of supplementary closure device 2200 may be in contact with pipe2400.

In certain embodiments, supplementary closure device 2200 may bedisposed within an outer housing 2210 of tubular 2100. In certainembodiments, outer housing 2120 may comprise any combination of featuresdiscussed above with respect to outer housing 1120.

In certain embodiments, outer housing 2120 may comprise a stop sleeve2121. In certain embodiments, stop sleeve 2121 may comprise anycombination of features discussed above with respect to stop sleeve1121.

In certain embodiments, an inner sleeve assembly may be disposed withinouter housing 1120. In certain embodiments, the inner sleeve assemblymay comprise inner sleeve 2133 and/or spacer sleeve 2134. In certainembodiments, inner sleeve assembly may be held in a down position by oneor more shear pins 2131. In such embodiments, the one or more flapperfingers of supplementary closure device 2110 may be held in the openposition and the torsion springs of supplementary closure device 2110may be torsionally loaded. In such embodiments, inner sleeve 2133 maycover the inner surfaces of the flapper fingers 2220 providingprotection and smooth flow of any wellbore fluids.

Furthermore, in such embodiments, once shear pin 2131 is sheared, gaspropellant or hydraulic pressure may move the inner sleeve 2133 upwardallowing for the one or more flapper fingers to rotate upward and bringsupplementary closure device 2110 into the partially closed position.

In certain embodiments, activation of explosive material 2150 may moveinner sleeve 2133 to shear shear pin 2131. In certain embodiments,explosive material 2150 may share any combination of features discussedabove with respect to explosive material 1150. In certain embodiments,explosive material 2150 may be disposed within an explosive cavity (notillustrated in FIG. 3).

In certain embodiments, pack-off device 2300 may share any combinationof features discussed above with respect to pack-off device 1300. Incertain embodiments, pack-off device 2300 may comprise an outer housing2310, an element reinforcement 2320, sealing element 2340, bottom sub2350, an injection port 2360, inflation element 2370, and seal 2380.

In certain embodiments, body 2310 may share any combination of featuresdiscussed above with respect to body 1310. In certain embodiments, body2310 may comprise an upper end and a lower end.

In certain embodiments, inflation element 2370 may comprise anycombination of features discussed above with respect to rubber inflationelement 1370. In certain embodiments, inflation element 2370 maycomprise continuous or discontinuous reinforcing ribs (made of stainlesssteel, or carbon steel) disposed outwith sealing element 2340.

In certain embodiments, bottom sub 2350 may comprise any combination offeatures discussed above with respect to bottom sub 1350. In certainembodiments, bottom sub 2350 may be may be held in place by a shear pin2390.

In certain embodiments, injection port 2360 may comprise any combinationof features discussed above with respect to injection port 1360.

In certain embodiments, illustrated in FIG. 3, pack-off device 2300 maybe in an uninflated position. In other embodiments, illustrated in FIG.4, pack-off device 2300 may be in an inflated position. In suchembodiments, pack-off device 2300 may provide a restriction of flowthrough tubular 2100. In certain embodiments, the restriction may be acomplete restriction or a partial restriction. In certain embodiments,approximately 100% of the flow through tubular 2100 may be restrictedonce pack-off device 2300 is inflated.

In certain embodiments, inflatable pack-off device 2300 may be capableof providing a pressure containment up to 5000 psi when in the inflatedposition. In certain embodiments, pack-off device 2300 may be capable ofproviding a pressure containment in excess of 5000 psi when in theinflated position. In certain embodiments, the selection of materialsused for pack-off device 2300, and the size of the tubular 2100 it isdisposed within, may govern the amount of pressure containment thatpack-off device 2300 may withstand.

In operation, supplementary closure device system 2000 may be activatedby activating both supplementary closure device 2200 and pack-off device2300 individually or together. In certain embodiments, supplementaryclosure device 2200 and pack-off device 2300 may be activatedsimultaneously. In other embodiments, supplementary closure device 2200and pack-off device 2300 may be activated sequentially. In certainembodiments, supplementary closure device system 2000 may be activatedby only activating one of supplementary closure device 2200 and pack-offdevice 2300.

In certain embodiments, supplementary closure device 2200 may beactivated by activating explosive material 2150. Explosive material 2150may be activated by a signal that is sent to a downhole receiver whichin turn activates/switches on a battery pack which sends an electricalcharge to the detonator package which ignites the primer and solidpropellant to create the gas pressure. Once activated, propellant gasgenerated from explosive material 2150 may be applied to inner sleeve2133 which then shears the one or more shear pins 2131. Once the one ormore shear pins 2131 have been sheared, pressure from the propellant gasgenerated from explosive material 2150 may then move inner sleeve 2133upwards until it contacts an inner shoulder of housing 2210. Thiscontact then allows torsion springs to urge the flapper fingers torotate around the pivot pins in the housing and move into the closedposition where they sealingly meet and mate together, thus restrictingor cutting off fluid/gas/entrained particle flow that may be flowing upfrom the wellbore.

Alternatively, in other embodiments, supplementary closure device 2200may be activated by utilizing hydraulic pressure rather than propellantgas to apply pressure to inner sleeve 2133.

In certain embodiments, pack-off device 2300 may be activated byactivating explosive material 2150. Explosive material 2150 may beactivated by a signal that is sent to a downhole receiver which in turnactivates/switches on a battery pack which sends an electrical charge tothe detonator package which ignites the primer and solid propellant tocreate the gas pressure. Once activated, propellant gas generated fromexplosive material 2150 may enter injection port 2360 of pack-off device2300. The propellant gas may then inwardly inflate the inflation element2370 until tubular is effectively sealed.

Alternatively, in other embodiments, pack-off device 2300 may beactivated by utilizing hydraulic pressure rather than propellant gas toapply pressure to inwardly inflate the inflation element 2370.

In certain embodiments, pack-off device 2300 and supplementary closuredevice 1200 may be activated by activating a single source of explosivematerial 2150. In other embodiments, pack-off device 2300 andsupplementary closure device 2200 may be activated independently byactivating separate explosive materials 2150.

In certain embodiments, the present disclosure provides a methodcomprising: providing a supplementary closure device system comprising asupplementary closure device, a pack-off device, and a tubular andactivating the supplementary closure device to seal the tubular. Incertain embodiments, the supplementary closure device system maycomprise any supplementary closure device system discussed above. Incertain embodiments, the supplementary closure device may comprise anysupplementary closure device discussed above. In certain embodiments,the supplementary closure device may comprise any pack-off devicedescribed above. In certain embodiments, the tubular may comprise anytubular discussed above.

In certain embodiments, providing a supplementary closure device systemmay comprise running a supplementary closure device and a pack-offdevice into a wellbore separately. In certain embodiments, providing asupplementary closure device system may comprise running a supplementaryclosure device and a pack-off device into a wellbore simultaneously. Incertain embodiments, providing a supplementary closure device system maycomprise running a combined supplementary closure device and a pack-offdevice into a wellbore as a single device.

In certain embodiments, activating the supplementary closure device maycomprise activating an explosive material. In certain embodiments, theexplosive material may be activated by a signal sent to a downholereceiver. In certain embodiments, once the explosive material has beenactivated, propellant gas may be generated from the explosive material.In certain embodiments, the propellant gas may be applied to an innersleeve of the supplementary closure device system. In certainembodiments, once the propellant gas is applied to the inner sleeve, theinner sleeve may move shearing the shear pins of the supplementaryclosure device system. In certain embodiments, once the shear pins havebeen sheared, pressure may move an inner sleeve of the supplementaryclosure device so that it contacts an inner shoulder of a spacer sleeve.In certain embodiments, once the inner sleeve is in contact with theinner shoulder of the spacer sleeve, the torsion springs may urge theflapper fingers to rotate around the pivot pins and move into the closedposition or the partially closed position.

In certain embodiments, the method may further comprise activating thepack-off device. In certain embodiments, the pack-off device may beactivated in any manner discussed above. In certain embodiments, thepack-off device may be activated by activating the explosive material.In certain embodiments, the explosive material may be the same explosivematerial used to activate the supplementary closure device. In otherembodiments, the explosive material may be a different explosivematerial than the explosive material used to activate the supplementaryclosure device.

In certain embodiments, the propellant gas generated from the explosivematerial may be used to inflate the pack-off device. In certainembodiments, the propellant gas may enter the injection port of thepack-off device thus inflating the pack-off device.

While the embodiments are described with reference to variousimplementations and exploitations, it will be understood that theseembodiments are illustrative and that the scope of the inventive subjectmatter is not limited to them. Many variations, modifications, additionsand improvements are possible.

Plural instances may be provided for components, operations orstructures described herein as a single instance. In general, structuresand functionality presented as separate components in the exemplaryconfigurations may be implemented as a combined structure or component.Similarly, structures and functionality presented as a single componentmay be implemented as separate components. These and other variations,modifications, additions, and improvements may fall within the scope ofthe inventive subject matter.

What is claimed is:
 1. A supplementary closure device system comprising:a tubular, a supplementary closure device disposed in the tubular,wherein the supplementary close device comprise a housing and one ormore flapper fingers disposed on the housing, and a pack-off device. 2.The supplementary closure device system of claim 1, wherein the tubularcomprises a casing string or a liner.
 3. The supplementary closuredevice system of claim 1, wherein the supplementary closure devicecomprises 6 flapper fingers.
 4. The supplementary closure device systemof claim 1, wherein the pack-off device comprises an inwardly inflatinginflatable packer.
 5. The supplementary closure device system of claim1, wherein the supplementary closure device is capable of transitioningfrom an open position to a closed position.
 6. The supplementary closuredevice system of claim 1, wherein the supplementary closure device is inan open position.
 7. The supplementary closure device system of claim 1,wherein the supplementary closure device is in a closed position.
 8. Thesupplementary closure device system of claim 1, wherein the pack-offdevice is in an uninflated position.
 9. The supplementary closure devicesystem of claim 1, wherein the pack-off device is in an inflatedposition.
 10. A supplementary closure device system comprising: atubular, a supplementary closure device disposed in the tubular, whereinthe supplementary close device comprise a housing and one or moreflapper fingers disposed on the housing, a pipe passing through thesupplementary closure device; and a pack-off device.
 11. Thesupplementary closure device system of claim 10, wherein the tubularcomprises a casing string or a liner.
 12. The supplementary closuredevice system of claim 10, wherein the supplementary closure devicecomprises 6 flapper fingers.
 13. The supplementary closure device systemof claim 10, wherein the pack-off device comprises an inwardly inflatinginflatable packer.
 14. The supplementary closure device system of claim10, wherein the supplementary closure device is capable of transitioningfrom an open position to a partially closed position.
 15. Thesupplementary closure device system of claim 10, wherein thesupplementary closure device is in an open position.
 16. Thesupplementary closure device system of claim 10, wherein thesupplementary closure device is in a partially closed position.
 17. Thesupplementary closure device system of claim 10, wherein the pack-offdevice is in an uninflated position.
 18. The supplementary closuredevice system of claim 10, wherein the pack-off device is in an inflatedposition.
 19. A method comprising: providing a supplementary closuredevice system comprising a supplementary closure device, a pack-offdevice, and a tubular and activating the supplementary closure device toseal the tubular.
 20. The method of claim 19, further comprisingactivating the pack-off device.